Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . The Derry-CoUard Co. from the inside. The hand hole is then covered up withthe plate A with a gasket between it and the boiler, tomake the seam air tight. The Riveting Machine. Nearly all riveting machines at the present timeare operated by hydraulic pressure. This pressure variesfrom one thousand to two thousand pounds pressure persquare inch. The diameters of the cylinders are suchthat the required pressure is obtained upon the 154 represents a cross section, through a pair ofdi
Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . The Derry-CoUard Co. from the inside. The hand hole is then covered up withthe plate A with a gasket between it and the boiler, tomake the seam air tight. The Riveting Machine. Nearly all riveting machines at the present timeare operated by hydraulic pressure. This pressure variesfrom one thousand to two thousand pounds pressure persquare inch. The diameters of the cylinders are suchthat the required pressure is obtained upon the 154 represents a cross section, through a pair ofdies and two plates. It will be seen that the dies do nottouch the plate and it should be a rule never to allow thedie to come in contact with the plate, but to take the en- 184 A defect of old riveters. tire pressure on the rivet head. This figure representswhat is altogther too common with old riveting ma-chines. A shows the difference between the center line ofthe two dies. This is brought about by the shifting of. Figure 154Riveting dies out of line. the stake on the frame. It can be remedied in a numberof ways, but should never be allowed to be much out ofline as the head of the rivet would not be central with thebody. This eccentricity of the head is a very bad thingwhen the rivet is in direct tension, as the stress in thiscase is much greater on one side of the rivet than on theother. Dies are always made of tool steel and should be keptin good shape. The number of rivets that such a die candrive, depends upon the steel, the pressure, the kind ofrivets and so on, and may vary anywhere from a few 185 Number that dies will drive. hundred to several thousand. As soon as the die getsout of shape, and always before it hits the sheet, it shouldbe sent back to the tool room and reshaped. Fig- 155 represents a flat lathe tool for shaping upa die for a button head rivet. The shape of the rivetheads is sometimes dependent upon what certainengineers consider correct and frequently th
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Keywords: ., bookcentury1900, bookdecade1910, bookidlocomotivebo, bookyear1912
